kmswebrtcendpoint: use RembEventManager to set the max local REMB
kmswebrtcendpoint: use RembEventManager to set the max local REMB

Change-Id: I733e8a7508bcf7dc79d64800fa47c02448449aad

shelsonjava/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements